And i think Ian meant to post this....

Gescom

Korg MS-20 Analog Filter for $70

I know it sounds like i'm a korg sales rep sometimes, but damn.

This little beast is a fun portable analog oscillator connected to a ribbon controller and run through the same filter as the MS-10 and MS-20. Nice, yes, for a toy. But the real magic is that you can run external audio through the vcf. This hooked up to any old yamaha portasound or whatever would be beastly, almost as beastly as the boner I have for analog filters.